Carnival is citing fuel costs as a reason not to return to Norfolk and why they are pulling out of Baltimore.

So let's see, Carnival has two choices here;

They can decide to abide by the existing sulfur emissions laws, which is better for the environment and the people living in the area, or they can stick their tongues out and penalize those passengers in the Mid-Atlantic region by moving these ships elsewhere in order not to worry about environmental impact laws.

Yes, they would encumber a slightly higher cost for the cleaner fuel and have to raise fares a little to cover it. But instead, they have chosen to say they could care less about their customers and the environment.